Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
Oxygen has low electron gain enthalpy in group 16 elements. Explain.
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Answer
Oxygen has low atomic size.
It has high electronegativity $(3.5)$.
It has high electron density.
The incoming electron is repelled due to high electron density hence oxygen has less negative value of electron gain enthalpy as compared to other group 16 elements. $O _{( g )}+ e ^{-} \rightarrow O ^{-}{ }_{( g )} \Delta_{ eg } H =-141 kJ mol ^{-1}$
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